A)\(\frac{x+1}{4}-\frac{x+2}{5}+\frac{x+4}{7}-\frac{x+5}{8}+\frac{x+7}{10}-\frac{x+9}{12}=0\)
B)\(\frac{x}{2004}+\frac{x+1}{2005}+\frac{x+2}{2006}+\frac{x+3}{2006}=4\)
C)\(\frac{x+2}{x-3}+\frac{x-2}{x+3}-\frac{2\left(x^2+6\right)}{x^2-9}=0\)
D)\(\frac{x^2-15x+1}{x+17}=x-2\)
E)\(\frac{x}{x^2+5x+6}=\frac{2}{x^2+3x+1}\)